History of the Atom
Who was the first person to name the atom
Democritus
What are the 3 subatomic particles?
protons, neutrons, electrons
What tells us the number of protons in an atom?
atomic number
What do elements in the same group have the same number of?
Valence electrons
left of metalloids/stairs
Who developed the first periodic table organized by mass
Mendeleev
Where is the mass of an element located?
nucleus
What does the mass number represent?
number of p+ and n0
What do elements in the same period have the same number of?
Energy levels
What are the 3 main element classifications?
metals, nonmetals, metalloids
What experiment led to Rutherford discovering the nucleus?
Gold Foil
What type of force keeps the electrons attracted to the nucleus
Electromagnetic
Atoms of the same element with different number of neutrons
Isotopes
Which group contains the most reactive METALS
Alkali Metals
metals
What was JJ Thomson's model called?
Plum Pudding
What happens to the energy of electrons as they move farther from the nucleus?
Increases
Write the nuclear notation for Carbon-14
14C
Which group contains the most reactive NONMETALS
Halogens
These types of elements have the same characteristics as metals and nonmetals
metalloids
Electrons travel in fixed orbits around the nucleus is who's model?
Bohr
What subatomic, subatomic particle makes up protons and neutrons
quarks
How do you determine the average atomic mass of an element for the periodic table?
weighted average of its isotopes
What type of elements do not bond (because they have 8 valence leectrons)
Noble Gases
When drawing a Bohr model, how can you determine the number of "rings" around the nucleus
Energy levels or periods on the PT